Bob's Machine 4 Inch Stainless Steel Bolt Kit, 3/8-16 UNC, 4-Pack - Transom to Jack Plate Mounting Bolts

The Bob's Machine 4 Inch Bolt Kit (Part Number: 110-100003) is a 4-pack of stainless steel mounting bolts sized for transom to jack plate installations. Each bolt measures 4 inches in length with a 3/8-16 UNC thread, a flat head style, and a right-hand, partially threaded thread style rated Grade 2 hardness. The stainless steel construction resists corrosion in marine environments, making this kit a practical choice for securing a jack plate to a boat transom or for other compatible marine hardware applications that call for a 4 inch, 3/8-16 UNC bolt. The bolts ship with an unfinished, silver exterior finish and a Thread Class of 1A. This kit includes 4 bolts as a complete set, so buyers replacing worn or corroded transom-to-jack-plate hardware can order one kit to cover a full mounting job. Because the kit is sold as a fastener set rather than a full mounting assembly, it is intended to pair with the nuts, washers, or plate hardware already in use on the boat. The 4-pack format and standardized 3/8-16 UNC thread size make it straightforward to match against existing jack plate or transom hardware without needing to source bolts individually.

Specifications

• Brand: Bob's Machine
• Manufacturer Part Number: 110-100003
• Product Name: 4 Inch Transom to Jack Plate Bolt Kit
• Number of Pieces: 4
• Material: Stainless Steel
• Bolt Length: 4 inches
• Thread Size: 3/8-16 UNC
• Thread Style: Right Hand
• Thread Coverage: Partially Threaded
• Thread Class: 1A
• Head Style: Flat
• Fastener Type: Bolt
• Manufacturer Grade: Grade 2
• Exterior Finish: Unfinished
• Color: Silver
• Item Dimensions: 6 x 4.5 x 1 inches
• Weight: 1.4 pounds

Frequently Asked Questions

What is included in the Bob's Machine 110-100003 bolt kit? The kit includes 4 stainless steel bolts, each 4 inches long with a 3/8-16 UNC thread, sold together as a set under part number 110-100003.

What thread size do these bolts use? Part number 110-100003 uses a 3/8-16 UNC thread with a right-hand, partially threaded thread style and a Thread Class of 1A.

What material are the bolts made from? The 110-100003 bolt kit is made from stainless steel, chosen for corrosion resistance in marine environments.

How long are the bolts in this kit? Each bolt in the Bob's Machine 110-100003 kit measures 4 inches in length.

What is this bolt kit designed to be used for? This 4-pack, sold as the 4 Inch Transom to Jack Plate Bolt Kit, is designed for securing a jack plate to a boat transom, and also suits other marine hardware that requires a 4 inch, 3/8-16 UNC bolt.

Are washers or nuts included with the 110-100003 kit? No, the Bob's Machine 110-100003 kit contains only the 4 bolts; it does not include separate nuts or washers.

What grade are the bolts rated? The bolts in kit 110-100003 are rated Grade 2 hardness.

What head style do the bolts have? Bob's Machine part number 110-100003 uses a flat head style bolt.

What finish do the bolts come in? The 110-100003 bolts have an unfinished, silver exterior finish.

How much does the bolt kit weigh? The Bob's Machine 110-100003 4-pack bolt kit weighs 1.4 pounds.

How many bolts come in one kit? One Bob's Machine 110-100003 kit contains 4 bolts.

What are the packaged dimensions of the kit? The 110-100003 bolt kit measures 6 x 4.5 x 1 inches as packaged.